It's still early in the pro day circuit, but prospects are already making the most of their second chances in testing. Two of the 2013 NFL Draft's best at their respective positions worked out at their pro days.

After mediocre 40 times at the NFL Combine in Indianapolis, Wisconsin running back Montee Ball and Mississippi State cornerback Johnthan Banks did their best to clear up speed concerns.

Montee Ball looks better with a faster 40-yard dash time. (AP Photo)

Ball was among the worst true running backs at the Combine by posting a 4.66 time in the 40-yard dash. However, as Optimum Scouting reported before pro day workouts started, there is concern that some Cybex testing at the Combine led to minor injuries before the main drills. This could be why Ball had such a big change in his 40 time Wednesday.

For a running back who relies on playing behind his pads and making decisive cuts, his 4.46 time according to BadgerNation is impressive. Only three running backs ran in the 4.4s at the Combine. Tony Pauline of DraftInsider, however, reported that Ball ran a 4.57 during his pro day. If teams can get past Ball's massive carry total over his career and the 4.46 time is more accurate, he could be in top-50 consideration.

As for Banks, his 4.61 time made him one of the Combine's trendy "losers" compared to the other top cornerbacks, especially Alabama's Dee Milliner. Banks, however, is a physical presence as a cornerback who transitions well and rarely gives a receiver separation when working downfield. His reported pro day time of 4.51 puts him in the middle to top end of the cornerback times at the Combine.

Considered the top senior cornerback by many, Banks still would be a surprise to fall out of the first round, and the 4.51 could solidify him as a top-20 talent on some boards.

Keep in mind that this is what pro days are all about for players who were invited to the Combine. Both Ball and Banks showed something they weren't able to in Indianapolis, and they get a chance to show their true speed in their comfort zone.

Currently, Ball has a third- to fourth-round grade from Optimum Scouting (though he is expected to be off the board in the top 100). Banks still has a first-round grade, and likely won't fall out of the top 32 picks on draft day.